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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | 6 |
| 3 | -2 |
| 4 | -24 |
| 5 | 24 |
| 6 | 120 |
| 7 | -240 |
| 8 | 24 |
| 9 | -720 |
| 10 | 2400 |
| 11 | -720 |
| 12 | 5040 |
| 13 | -25200 |
| 14 | 15120 |
| 15 | -720 |
| 16 | -40320 |
| 17 | 282240 |
| 18 | -282240 |
| 19 | 40320 |
| 20 | 362880 |
| 21 | -3386880 |
| 22 | 5080320 |
| 23 | -1451520 |
| 24 | 40320 |
| 25 | -3628800 |
| 26 | 43545600 |
| 27 | -91445760 |
| 28 | 43545600 |
| 29 | -3628800 |
| 30 | 39916800 |
| 31 | -598752000 |
| 32 | 1676505600 |
[1,-2,6,-2,-24,24,120,-240,24,-720,2400,-720,5040, -25200,15120,-720,-40320,282240,-282240,40320, 362880,-3386880,5080320,-1451520,40320,-3628800, 43545600,-91445760,43545600,-3628800,39916800, -598752000,1676505600] |